<template>
    <div v-if="loading" class="loader-container">
      <div class="loader">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
      </div>
    </div>
  </template>
  
  <script>
  export default {
    data() {
      return {
        loading: false
      }
    },
    methods: {
      startLoading() {
        this.loading = true
      },
      stopLoading() {
        this.loading = false
      }
    }
  }
  </script>
  
  <style>
  .loader-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 9999;
  }
  
  .loader {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 80px;
  }
  
  .loader div {
    box-sizing: border-box;
    display: block;
    position: absolute;
    width: 64px;
    height: 64px;
    margin: 8px;
    border: 8px solid #fff;
    border-radius: 50%;
    animation: loader 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
    border-color: #fff transparent transparent transparent;
  }
  
  .loader div:nth-child(1) {
    animation-delay: -0.45s;
  }
  
  .loader div:nth-child(2) {
    animation-delay: -0.3s;
  }
  
  .loader div:nth-child(3) {
    animation-delay: -0.15s;
  }
  
  @keyframes loader {
    0% {
      transform: rotate(0deg);
    }
    100% {
      transform: rotate(360deg);
    }
  }
  </style>